That's what they were and now I know where I saw them at. It was on a truck show on TV last weekend and they were building a buggy with some pretty big tires. And yes they were using some really big Rockwells with pinion brakes. That was extreme but it looked cool though.

01' TJ Wangler, 6" Ruff Country X Series, 35" x 12.5" Mickey Thompsons On 15 x 10" rims w/ simi Bead Lock, Matching Warn Bumpers, 9500xi Warn Wench, Tom Woods Drive Shaft And SYE, And A K+N Cool Air Intake. Still Improving